How to power Nodemcu using 12 volt AC to DC adapter?

Question

I am trying to make a small project using Nodemcu. My project is WiFi controlled LED, 2 LED's will blink at the same time. I have successfully uploaded the code and it works fine using USB connection. But I want to power the Nodemcu using 12 volts 1.5 amps AC to DC adapter. I have checked it in web search but I have not found an understanding circuit. please help me out guys.

Answer 1

You connect the + side of the adapter to VIN pin and the - side to GND.

You have to check the maximum voltage when using the VIN pin. Probably it means you 'waste' some power (but it's from a wall wart, so it should be ok). See the remark of Flyingfenix below for heating consequences.

See this link: Power Related ESP-12E Development Board Pins, fragment 'Using a Wall Wart':

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Examples: Wall-Mount-AC-Adapters

The current (1.5A) should be more than enough; the adapter's current should be higher than what is needed by the NodeMCU + circuit. So this is ok.

• Vikranth N: Thankyou Michel Keijzers. I will go ahead and try the connection today. cheers..!!
• Flyingfenix: Please note that the regulator used (AMS1117 3.3V or equivalent) is a linear regulator, meaning that it "wastes" everything above 3.3V as heat. Using a 12V or above supply and loading the module's outputs/using wifi means it will run very hot - possibly even damaging it. Use, if possible, a 5V wall wart - temperatures will be much lower.
• S. Imp: NodeMCU is not an Arduino and I've seen stories about them burning up when supplied with voltage too high.
• Michel Keijzers: @S.Imp Thanks for that remark, I removed the +20V as I cannot find it (anymore).
• S. Imp: @MichelKeijzers your answer is pretty helpful. You might offer a link to 3.3V wall warts or to one of the voltage regulators mentioned here